US20020036494A1 - Bearing housing with speed measurement device - Google Patents

Bearing housing with speed measurement device Download PDF

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Publication number
US20020036494A1
US20020036494A1 US09/964,446 US96444601A US2002036494A1 US 20020036494 A1 US20020036494 A1 US 20020036494A1 US 96444601 A US96444601 A US 96444601A US 2002036494 A1 US2002036494 A1 US 2002036494A1
Authority
US
United States
Prior art keywords
bearing housing
sensor
component
shaft
outer peripheral
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US09/964,446
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English (en)
Inventor
Sture Ostling
Uno Axelsson
Reijo Eriksson
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SKF AB
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Assigned to AKTIEBOLAGET SKF reassignment AKTIEBOLAGET SKF ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: ERIKSSON, REIJO, AXELSSON, UNO, OSTLING, STURE
Publication of US20020036494A1 publication Critical patent/US20020036494A1/en
Abandoned legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
    • G01P3/00—Measuring linear or angular speed; Measuring differences of linear or angular speeds
    • G01P3/42—Devices characterised by the use of electric or magnetic means
    • G01P3/44—Devices characterised by the use of electric or magnetic means for measuring angular speed
    • G01P3/443—Devices characterised by the use of electric or magnetic means for measuring angular speed mounted in bearings
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/042—Housings for rolling element bearings for rotary movement
    • F16C35/047—Housings for rolling element bearings for rotary movement with a base plate substantially parallel to the axis of rotation, e.g. horizontally mounted pillow blocks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C35/00—Rigid support of bearing units; Housings, e.g. caps, covers
    • F16C35/04—Rigid support of bearing units; Housings, e.g. caps, covers in the case of ball or roller bearings
    • F16C35/06—Mounting or dismounting of ball or roller bearings; Fixing them onto shaft or in housing
    • F16C35/063—Fixing them on the shaft
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C41/00—Other accessories, e.g. devices integrated in the bearing not relating to the bearing function as such
    • F16C41/007—Encoders, e.g. parts with a plurality of alternating magnetic poles
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2226/00—Joining parts; Fastening; Assembling or mounting parts
    • F16C2226/50—Positive connections
    • F16C2226/60—Positive connections with threaded parts, e.g. bolt and nut connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16C—SHAFTS; FLEXIBLE SHAFTS; ELEMENTS OR CRANKSHAFT MECHANISMS; ROTARY BODIES OTHER THAN GEARING ELEMENTS; BEARINGS
    • F16C2240/00—Specified values or numerical ranges of parameters; Relations between them
    • F16C2240/40—Linear dimensions, e.g. length, radius, thickness, gap
    • F16C2240/46—Gap sizes or clearances

Definitions

  • the present invention generally relates to a bearing housing. More particularly, the present invention pertains to a bearing housing provided with a speed measurement device.
  • the present invention provides a relatively simple, inexpensive and reliable measurement device in a bearing housing for metering or measuring the rotational speed of a shaft supported in at least one bearing in the bearing housing.
  • the invention is particularly useful at low rotational speeds of up to, for example, 900 rpm.
  • a bearing housing is used in conjunction with a speed measurement device incorporating a sensor to detect the rotational speed of a shaft supported in a bearing in the bearing housing.
  • the sensor is arranged to detect at least one marking rotating with the shaft and has a cable connected to an external evaluation unit.
  • the marking is in the form of an irregular surface portion of a component present in the bearing housing for another mechanical purpose, with the component rotating with the shaft.
  • a bearing housing has a bearing and a shaft positioned therein, with the shaft being rotatably supported by the bearing, and the bearing being arrested to the shaft by way of a lock nut and a locking washer.
  • the lock nut and the locking washer rotate together with the shaft and each possesses an outer peripheral surface.
  • a sensor is mounted in the bearing housing and has a free end directed at the outer peripheral surface of one of the lock nut and the locking washer.
  • the outer peripheral surface of the one of the lock nut and the locking washer is provided with a surface irregularity which the sensor can distinguish from other portions of the outer peripheral surface of the one of the lock nut and the locking washer.
  • the sensor is connected to a cable adapted to be connected to an evaluating unit external of the bearing housing to determine the rotational speed of the shaft by sensing the surface irregularity during rotation of the shaft.
  • Another aspect of the invention involves the combination of a bearing housing in which is positioned a bearing and a shaft rotatably supported by the bearing, and a speed measurement device for determining a speed of rotation of the shaft.
  • a component different from the shaft and the bearing is positioned within the bearing housing and rotates together with the shaft.
  • the speed measurement device includes a sensor mounted in the bearing housing and having a free end directed at the outer peripheral surface of the component.
  • the outer peripheral surface of the component is provided with an irregular surface portion which the sensor is able to distinguish from other portions of the outer peripheral surface of the component.
  • the sensor is connected to a cable adapted to be connected to an evaluating unit external of the bearing housing to determine the rotational speed of the shaft by sensing the irregular surface portion of the component during rotation of the shaft and the component in the bearing housing.
  • FIG. 1 is a side view a bearing housing with a measurement device in accordance with the present invention, with a part of the bearing housing outer wall being removed for illustrative purposes.
  • FIG. 2 is a side view of the upper half of the bearing housing shown in FIG. 1.
  • FIG. 3 is a front view of the upper half of the bearing housing shown in FIG. 2, with a portion of the housing wall cut away around the position of the sensor fitted to the upper bearing housing half.
  • FIG. 4 is a cross-sectional view of a component provided in the interior of the bearing housing.
  • FIG. 5 is a planar side view of the component shown in FIG. 4.
  • FIG. 1 illustrates a portion of a shaft rotatably supported in a bearing 2 , which is fitted in a seat in a bearing housing 3 .
  • the bearing housing 3 is shown from an end face and has a base 4 made in on piece with a first, lower bearing housing half 5 .
  • this lower bearing housing half 5 has a pair of threaded through holes 6 , 7 intended for fitting sensors used for vibration measuring purposes. These through holes 6 , 7 and their associated sensors are not specifically related to the invention here and so a further detailed description is not included.
  • the bearing housing 3 further includes a second, upper bearing housing half which is sometimes referred to in the art as a cap 8 .
  • the second, upper bearing housing half or cap 8 is shown in FIG. 1 with a portion cut away to illustrate a part of the interior of the bearing housing 3 .
  • the bearing 2 is attached to the shaft 1 with aid of a lock nut 9 and a locking washer 10 .
  • the cap 8 is also provided with a threaded through-hole 11 in which is inserted or positioned a sensor 12 .
  • the free end 13 of the sensor 12 is positioned at a short distance from the outer peripheral surface of the lock nut 9 .
  • the sensor 12 is connected, via a cable 14 , to an external evaluation unit, for establishing and detecting the rotational speed of the shaft 1 . In the described and illustrated embodiment, the sensor 12 detects the rotational speed of the lock nut 9 which rotates together with the shaft 1 .
  • the external evaluation unit 20 is schematically illustrated in FIG. 3.
  • FIG. 2 illustrates, by way of an end view, the cap 8 and the position of the sensor 12 with its associated cable 14 .
  • a raised portion 15 is provided in the center of the end side of the housing. This raised portion 15 forms a seat for a bolt that connects the cap 8 to the first, lower bearing housing half or base.
  • FIG. 3 illustrates the bearing housing cap 8 according to FIG. 2 as seen from the front, with a portion being cut out or removed in the region of the sensor 12 for better illustrating the interior of the bearing housing.
  • a portion of the lock nut 9 can be seen in the cut out portion.
  • the lock nut 9 is used in a conventional manner for arresting the bearing 2 to the shaft 1 as seen in FIG. 1 and mentioned above.
  • the lock nut 9 which is preferably a metallic lock nut, is shown in more detail in cross-section in FIG. 4 and in the end view of FIG. 5.
  • the lock nut 9 comprises a ring member or annular member having an internal thread 16 for connection to an external thread on the shaft 1 , and by means of which the bearing can be clamped against a shoulder on the shaft 1 or the like. Externally, the ring-shaped member or lock nut 9 is provided with an irregular surface portion or surface irregularities. In the illustrated embodiment, a plurality of key grip recesses 17 constitutes the irregular surface portion or surface irregularities. The sensor 12 is able to distinguish the surface irregularities or irregular surface portion from the other portions of the outer peripheral surface of the lock nut 9 .
  • the lock nut 9 is provided with four equidistantly positioned recesses 17 . These recesses 17 permit a hook spanner to be applied or utilized to tighten the lock nut 9 on a thread in the shaft or on a sleeve.
  • the free end 13 of the sensor 12 is positioned in close proximity to the outer peripheral surface of the lock nut 9 , and with its longitudinal direction positioned perpendicularly to the peripheral surface of the lock nut 9 .
  • the spacing between the end surface of the sensor 12 and the outer peripheral surface of the lock nut 9 is partly dependent on the type of sensor used. Distances up to about 2 mm are useful, although best results are obtained if the distance is about 1 mm.
  • the lock nut 9 When tightened, the lock nut 9 is fixedly attached to the shaft 1 so that the lock nut will rotate at the same speed as the shaft 1 .
  • an inductive sensor is used, for instance a sensor from Gerhard Balluff GmbH & Co, Neuhausen, Germany, available on the market under the name Balluff BES 516-325-E5-Y-S49.
  • the sensor 12 With this sensor 12 positioned with its free end 13 at a distance of preferably about 1 mm from the outer peripheral surface of the lock nut 9 , the sensor 12 will detect the passage of each recess 17 in the lock nut 9 as these recesses 17 move past the sensor 12 during rotation of the shaft 1 and the lock nut 9 . Each passage of a recess 17 produces a pulse which, via the cable 14 , is transferred to the external evaluation unit. In this manner, and with the illustrated number of recesses, each 360° revolution results in four pulses being transferred to the evaluation unit. The evaluation unit can then establish in a simple manner the current rotational speed of the shaft 1 , even at comparatively low speeds, for example between 50 rpm and 900 rpm.
  • lock nuts of the type illustrated having four key grip recesses. It is also possible to use lock nuts having a different number of spaced apart recesses.
  • the lock nut can be provided with eight evenly spaced apart recesses, whereby the evaluation unit is programmed to count eight pulses for 360 degrees of rotation.
  • the component present in the bearing housing is thus a lock nut intended primarily for another mechanical purpose, namely to arrest the bearing to the shaft, with the irregular surface portion functioning as the markings being the key grip recesses present in the outer peripheral surface of the lock nut for allowing tightening of the lock nut.
  • the component e.g., the lock nut
  • which primarily functions for other mechanical purposes, is different from the shaft and the bearing, yet rotates together with the shaft, with the sensor being adapted to distinguish the surface irregularities or irregular surface portion of the component from other portions of the component to allow the rotational speed of the shaft to be determined.
  • the invention is not limited to a component such as the lock nut.
  • the component could instead be, for example, a locking washer such as the locking washer 10 illustrated in FIG. 1.
  • the irregular surface portion on the component is not necessarily limited to recesses, but can instead be other surface irregularities, such as elevated portions or the like.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Rolling Contact Bearings (AREA)
US09/964,446 2000-09-28 2001-09-28 Bearing housing with speed measurement device Abandoned US20020036494A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0003483-5 2000-09-28
SE0003483A SE0003483L (sv) 2000-09-28 2000-09-28 Lagerhus med hastighetsmätanordning

Publications (1)

Publication Number Publication Date
US20020036494A1 true US20020036494A1 (en) 2002-03-28

Family

ID=20281206

Family Applications (1)

Application Number Title Priority Date Filing Date
US09/964,446 Abandoned US20020036494A1 (en) 2000-09-28 2001-09-28 Bearing housing with speed measurement device

Country Status (5)

Country Link
US (1) US20020036494A1 (ja)
EP (1) EP1193500A2 (ja)
JP (1) JP2002181059A (ja)
CN (1) CN1344935A (ja)
SE (1) SE0003483L (ja)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102012006158A1 (de) * 2012-03-28 2013-10-02 Schaeffler Technologies AG & Co. KG Lageranordnung

Also Published As

Publication number Publication date
CN1344935A (zh) 2002-04-17
JP2002181059A (ja) 2002-06-26
SE0003483L (sv) 2002-03-29
SE0003483D0 (sv) 2000-09-28
EP1193500A2 (en) 2002-04-03

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Owner name: AKTIEBOLAGET SKF, SWEDEN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:OSTLING, STURE;AXELSSON, UNO;ERIKSSON, REIJO;REEL/FRAME:012304/0597;SIGNING DATES FROM 20011018 TO 20011019

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION